Arc-lamp.



A. C. ROEBUGK.

ARC LAMP.

APPLI ATION FILED 00T. 24, 1910.

,.IITIIIIIIIIIII IIIIIII Jy #f 3 SHEETS-SHEET 1.

Mnl/M@ mi Patented Dec. 8, 1914.

A. C. ROEBUGK.

ARC LAMP.

APPLICATION FILED 06T. 24, 1910.

Patented Deo. 8, 1914.

3 SHEETS-SHEET 2.

A. G.-ROEBUGK.

ARG LAMP.

APPLICATION FILED 0G'1.24, 1910. 1,1 20,086, Patented Dec. 8, 1914.

3 SHEETS-SHEET 3.

Y lHu www i UNITED STATES PATENT Omron.

ALVAH C. ROEBUCK, OF CHICAGO, ILLINOIS, ASSIGNOR T0 THE ENTERPRISE OPTICAL MFG. COMPANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

ARC-LAMP.

Matrose.

Specification of Letters Patent.r

Patented Dec. 8, 1914.

Application led October 24, 1910. Serial No. 588,608.

To all whom t may com ern VBe it known that I, ALVAH C. ROEBUCK,

`Cook and State of Illinois, have invented certain new' and useful Improvements in Arc-Lamps, of which the following is a specification.

This invention relates to that type of electric arc-lamps used in the lamp houses of optical projecting apparatus andthe like, and in which the various adjustments of the lamp mechanisms are manually attained by operating shafts which extend outside the walls of the lamp house. And the present improvement has for its object to provide a simpleand efiicient structural formation and combination of parts, with which the different vertical, angular or tilting, and turning adjustments of the lamp mechanism are attained in an accurate and convenient manner, and with an avoidance of lost motion and undue friction between the parts.

A further object `is to provide means whereby a longitudinal adjustment of the upper lamp carbon, in relation to the lower lamp carbon, is attained in a ready and accurate manner, all as will hereinafter more fully appear.

In the accompanying drawings :-Figure 1, is a general side elevation illustrative of the present invention. Fig. 2,is a detail horizontal sectional view on line Fig. 1.

Fig. 3, is adetail longitudinal sectional elevation on line ai', Fig. 4. Fig. 4,'is a detail transverse sectional elevation on line m2, Fig. 2. Fig. 5, isa detail central vertical sectional elevation of the adjustable rack bars and their accessories. Fig. 6, is a detail horizontal sectional view on line m3, Fig.`

5, Fig. 7, is a detail plan view with parts in section of the upper carbon holder and its supporting and adjusting means. Fig. 8, is

-. portion of the track rails upon which the carriage or-turret base 2, of the arc-lamp is supported in a manner to permit of allongitudinal sliding'adjustment. Said rails are secured to the base or bottom plate of the' lamp house in the usual manner.

3 is a longitudinally arranged screw-shaft journaled in a supporting bracket of one of the -track rails l, and having its screwthreaded portion engaged in the screwthreaded bore of a sleeve 4 on the turret base 2 aforesaid to impart longitudinal adljustment to the same upon the manual rotation of the shaft 3.

5, is a turret head having a vertically depending shank adapted for engagement in a corresponding socket sleeve 6 on the turret base 2 to support' the turret head 5 in place, and in a manner which admits of a turning adjustment of the turret head in attaining the proper longitudinal arrangement of the lamp mechanism carried thereon.A As usual in such type of connections the socket sleeve 6 will be provided with any usual and ordi- -nary provision whereby its frictional engagement with the vertical shank of the'turret head 5, can be adjusted as required.

7 is a shaft having a screw-threaded portion turning in a bracket lug on the turret base 2 and provided with a peripherally grooved head or enlargement at its forwardend adapted for operative engagement with a crank pin 8 on the underside of the turret head 5 Ato impart a turning adjustment to the same.

9 is a laterally arranged standard extending upward from the turret head 5 and carrying pivot screws or studs 10 and 11 in vertically separated relation as shown.

12'are a pair of ears arranged in longitudinal adjustment on the turret head 5 and adapted to carry the adjusting shaft hereinafter described.

13 is theblock or housing in which the pair of oppositively moving rack bars of the carbon Vcarriers are guided in their movements past each other in the various adjustments of the same.

14 is a depending arm on the-block or housing 13 for connection with the intermediate connections as follows 15 is a radius link pivoted at' one end to the upper pivot screw 10 of the aforesaid standard 9, vand at its other end to the depending arm 14 above described.

l16 is a bell crank lever pivoted to the lower pivot screw 11 of the aforesaid standard 9. The horizontal arm 17 of said lever is pivoted at its .forward end to the aforesaid depending arm 14, and has a parallel relation to the above described radius link 15 to act therewith as a secondary radius link, with1 the combined action of the two adapted to impose a vertical rise and fall upon the block or housing 13 and the. lamp parts carried thereon, without any tiltingA of the same from a normal plane. The vertical arm 18 of said lever is provided at its lower or free end with a lateral stud or its equivalent for operative engagement with an -adjusting mechanism as follows:

19 is a longitudinal shaft lguided inthe Aaforesaid alined ears 12 of the turret head 5 and having a screwlthreaded end portion which engages in asimilarly formed bore ofv one of said ears, so that a rotary motion o fthe shaft will'efiect a corresponding longitudinal travel ofthe same.

20 are a pairI of separated collars on the shaft A19, between which the before described lateral vstud on theivertical arm 18 ofl the bell crankl lever 16 engages to receive an' oscillatory adjustment therefrom.-

21 and 22"are the lrack bars', before re- 'ferred to,'and whichV are arranged and held in parallel and separatedr'elation by f'gu1de-- ways in the block or hqusing 13 aforesaid, and' with their toothed faces opposed as usual." f

23, isla pinion arranged between the rack bars 21 and 22 and having lmeshingenga'gement with the teeth of said rack bars, so that with `a rotation of the inion movement in opposite 'directions wil 'be imparted to the respective rack bars. j

24 is the carrying, and operating shaft of the pinion 23, journaled in the block 'dor housing 13 aforesaid and having' operative connection with a secondary shaft 24 by a` universal joint or connectionpreferablyof the ype shown in- Figs. 5 and 6, and in whichz 23 is a longitudinal extension fixedly secured to anf'end of the pinion sh`aft24, and formed at its free end into al sphere `23 having 'diametrically disposed "studs 23' as shown.

24" isa sleeve secured tothe `end of 'the end of the rack bar 21 of the upper carbon carrier andformed with two pairvof guide ears 26 and 27, each pair being in longitudinal alinement.

28 is an adjustable headstock provided with a longitudinal guide bar or rod 29 ,which has sliding engagement in orices formed therefor in a pair of the guide ears 26, aforesaid.- Said headstock also carries a forwardly projecting bracket arm 30 to which the upper carbon carrying arm of the lamp is adjustably secured as hereinafter morefully described.

31 is.a longitudinal screw shaft journaled in the 'rearmost ofthe other pair of ears 27 aforesaid, with its screw-threaded forward `portion screwing into a correspondingly -formed tubular extension of the headstock 28, which in turn has sliding engagement in the forwardcarY of the aforesaid pair of ears 27 as shown. lVith such construction a rotation of the shaft 31 is adapted to impart tached together with lan insulating block 32 l interposed at their point offconnection to insulate the forward section of said arm and' the parts carried thereon from the main prtion of the lamp. e l l 33 '1s the upper carbon carrying arm, the

rear end of which is secured in a' vertically adjustable manner to the forward end of' thel bracket arm 3 0 aforesaid by a' pivot screw or boltv 34, and a clamping screw 35 attached toene part and having adjustment in a segmental series of, holes 36 Iin the othergpart,

the construction affording a limitedy adjustment between the parts, andin avertcal plane, as required.

end and tted'inY a transverse oriiice'in the outer end of the carbon carrying arm: 33. aforesaid, and held therein by one or more marginalscrewsBS,

. i 37 "1s a cylindrical bushing flanged atpne correspondirgly formed.

e ;Lozs`l as shown, and which/with' a loosening of said screws permits ofaturning.adjustment of the said bushing and the'holding'clamp 1 and upper lamp carbon carried thereby. Said bushing is formed with a central bore, one portion of which is circular and forms a guide for the stem of the carbon clarnp.I vandthe theriportioli 'f 'whiclfis of a nonj'circulaiform and provides a guide for the middle non-circular portion of said carbonl clamp to admit of a sliding movement be tween the parts and yet prevent any independent turning movement.

39 is the holding clamp for the upper lamp carbon 40, above referred to. In thc present construction said Vclamp is provided with an endhead 41 formed with a transverse opening for the reception ofthe lamp carbon 40; a central noncircular port1on 42 adapted for sliding engagement 1n the noncircular portion ofthe orifice aforesaid of the bushing 37, and a screw-threaded end stem for engagement with a wingedclamping nut 43, that has bearin on the slde of the bushing 37 opposite to t e end head 41,

and which in action is adapted to draw said head toward the bushing to firmly clamp the lamp carbon in place.

44 is a bracket head fixedly secured tothe lower end of the rack bar 22 of the lower l lamp carbon carrier.

45 is a forwardly projecting bracket arm attached to the bracket head 44 with an in-` outer end of the lower carbon carrying arml 47. aforesaid. The said bushing is substantially identical with the bushing 37 of the upper carbon carrying arm 33 before described, and is formed with a central bore,

one portion of which is circular for the guidance of the stem of a carbon clamp, and

another portion of ,which is non-circular for A 30` the guidance of the middle non-circular por- ,tion` of said carbon clamp to admit of a sliding movement between the parts without any independent turning movement between he same.

52 are pmarginal screws by which said bushing 51 is clamped in placeafter the required turning adjustment of the same has been effected. 4

53 is the holding clamp' of the lower lamp carbon 54 above referred to. Said clamp is substantially identical with the upper .carbon clamp 39, above described, in its construction and arrangement and consists of an end head 5 having a transverse opening for the reception of the lower lamp carbon 54; a central non-circular portion adapted forisliding non-rotatable engagement in the non-circular portion of thebore of the bushing 51 aforesaid, and screw-threaded stem for engagement with the winged clamping nut 57, by which the lower lamp4 carbon is clamped in place.

58 and 59 are hook shaped ears carried by the respective bracket arms 30 and 45 aforesaid, in adjacent relation to the binding posts or screws 60 and 61 on said arms and by means of which the terminal ends of the electric cables are electrically connected to the respective carbon carrying arms and carbons of the lamp. In the present construction the respective cables 62 and 68 are looped laterally under the aforesaid hook shaped ears 58 and 59 and are held thereby so that the normal bendings of said cables in the dierent. adjustments of the lamp parts, is imposed on the cables between the entrance bushings 64 therefor in the wall 65 of the-lamp house, and the aforesaid ears 58 and 59, and all bending strains on the terminal connections prevented.

The various operating shafts 3, 7, 19 and 24 heretofore described are of some length and are adapted to extend outside the rear wall 65 of the lamp house, and at their outer ends are provided with operating wheels or handles for convenient operation by hand. And where such shafts have movement of any extent in angular planes, each shaft will be divided into sections which are connected together by any ordinary form of universal joint.

Having thus fully described my said invention what I claim as new and desire to secure by Letters Patent, is

1. An arc-lamp for optical projection apparatus, comprising an arc-lamp mechanism, a revoluble head carrying said mechanism and provided with a crank pin, a base carrying said head and provided with a pair of separated supporting ears one of which has its borescrew-threaded, and a longitudinally disposed shaft provided with spaced collars for operative engagement with the aforesaid crank pin and having a screwthreaded end portion for operative engagement with the screw-threaded bore of the supporting ear aforesaid. Y

2. In an arc-lamp for optical projecting apparatus, a housing carried by the lamp mechanism, a bracket mounted. on said housing and provided with a series of guide ears, a headstock having a longitudinal guide bar moving'in a pair of said guide ears and provided with a screw-threaded recess, and an adjusting screw shaft journaled in another of said guide ears and screwing into the screw-threaded recess of the headstock, aforesaid.

Signed at Chicago, Illinois this 21st day j of October 41910.

ALVAH C. ROEBUCK.

Witnesses:

ROBERT BURNS, n HENRY MOE. 

